using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.Rendering;
using UnityEngine.SceneManagement;

public class MazeGenerator : MonoBehaviour
{
    public Material Wall;
    public Color Hedge;
    public GameObject Plane;
    public Material SmileyMat;

    private List<GameObject> OuterBorder;

    public Shader Shader;
    List<List<Vector3>> Grid;
    List<List<Cell>> CellGrid;
    ObjectPoints PointsOnThePlane;
    int MazeWidth = 11;
    int MazeHeight = 11;
    readonly int planeHeight = 11;
    readonly int planeWidth = 11;
    GameObject BorderParent;
    RecursiveBacktracker RB;
    SortingLayer sortingL;
    int sortingLayer = 0;
    bool goaled;


    private void OnEnable()
    {
        SmileyTrigger.OnEnterSmiley += ReduceMaze;
    }

    private void Onisable()
    {
        SmileyTrigger.OnEnterSmiley -= ReduceMaze;
    }


    void Start()
    {
        goaled = false;
        OuterBorder = new List<GameObject>();
        BorderParent = new GameObject("BorderParent");
        PointsOnThePlane = this.GetComponent<ObjectPoints>();
        RB = new RecursiveBacktracker();
        CreateNewMaze();
    }

    private void Update()
    {
        if (goaled)
        {
            BorderParent.transform.Translate(Vector3.down * Time.deltaTime);

            if (BorderParent.transform.position.y < -2.3f)
            {
                Singleton.Instance.transform.position = Vector3.zero;
                SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
            }
        }
    }

    public void CreateNewMaze()
    {
        Destroy(BorderParent);
        BorderParent = new GameObject("BorderParent");

        MazeWidth = planeWidth;
        MazeHeight = planeHeight;
        CreateTheGrid();
        CellGrid = RB.GetNewMaze(Grid);

        ShowMaze();
    }

    void CreateTheGrid()  //creates grid with given width and length from the points on the plane
    {
        Grid = new List<List<Vector3>>();
        List<Vector3> OneRow = new List<Vector3>();

        for (int y = 0; y < MazeHeight; y++)
        {
            for (int x = 0; x < MazeWidth; x++)
            {
                OneRow.Add(PointsOnThePlane.GetObjectGlobalVertices()[y + x * planeHeight]); //getting the points on the plane from the upper left corner
            }
            Grid.Add(OneRow);
            OneRow = new List<Vector3>();
        }
    }

    void ShowMaze()  //Creates maz with borders as cubes
    {
        GameObject VerticalBorder = GameObject.CreatePrimitive(PrimitiveType.Cube);  //vertically scaled cube for up and down borders
        VerticalBorder.transform.localScale = new Vector3(1.5f, 1, 0.5f);
        //VerticalBorder.GetComponent<MeshRenderer>().material.SetColor("_Color", Hedge);
        VerticalBorder.GetComponent<MeshRenderer>().material = Wall;

        GameObject HorizontalBorder = GameObject.CreatePrimitive(PrimitiveType.Cube);//horizontally scaled cube for left and right borders
        HorizontalBorder.transform.localScale = new Vector3(0.5f, 1, 1.5f);
        //HorizontalBorder.GetComponent<MeshRenderer>().material.SetColor("_Color", Hedge);
        HorizontalBorder.GetComponent<MeshRenderer>().material = Wall;

        for (int x = 0; x < MazeWidth; x++)
        {
            for (int y = 0; y < MazeHeight; y++)
            {
                if (CellGrid[y][x].Borders.Contains(Direction.Up))
                {
                    PlaceHorizontalBorder(HorizontalBorder, CellGrid[y][x], Direction.Up);
                }
                if (CellGrid[y][x].Borders.Contains(Direction.Down))
                {
                    PlaceHorizontalBorder(HorizontalBorder, CellGrid[y][x], Direction.Down);
                }

                if (CellGrid[y][x].Borders.Contains(Direction.Right))
                {
                    PlaceVerticalBorder(VerticalBorder, CellGrid[y][x], Direction.Right);
                }
                if (CellGrid[y][x].Borders.Contains(Direction.Left))
                {
                    PlaceVerticalBorder(VerticalBorder, CellGrid[y][x], Direction.Left);
                }
            }
        }

        GameObject.Destroy(VerticalBorder); //destroy source objects
        GameObject.Destroy(HorizontalBorder);
        //Rigidbody rb = BorderParent.AddComponent<Rigidbody>();
        //rb.constraints = RigidbodyConstraints.FreezeAll;
        BorderParent.layer = 12;       


        foreach (Transform child in BorderParent.transform)
        {
            child.gameObject.tag = "Hedge";
            child.gameObject.isStatic = true;
            BoxCollider bc = child.GetComponent<BoxCollider>();           
            child.gameObject.layer = 12;
            //child.gameObject.GetComponent<MeshRenderer>().enabled = false;

            if (child.position.x == -5.5f || child.position.x == 5.5f || child.position.z == -5.5f || child.position.z == 5.5f)
            {
                OuterBorder.Add(child.gameObject);
            }


            //if (child.position==VRCam.transform.position)
            //{
            //BorderCube löschen, wenn Camera da am Start liegt!
            //}
        }


        // Cut exit
        GameObject exit = OuterBorder[Random.Range(0, OuterBorder.Count - 1)];
        Vector3 pos = exit.transform.position;
        Destroy(exit);
       
        
        
        // Smileyinstantiation and position
        GameObject smiley = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        smiley.name = "Smiley";
        smiley.transform.position = pos * 2;
        smiley.AddComponent<TurnAround>();
        MeshRenderer mr = smiley.GetComponent<MeshRenderer>();
        SphereCollider sc = smiley.GetComponent<SphereCollider>();
        Rigidbody rbSmile = smiley.AddComponent<Rigidbody>();
        sc.isTrigger = true;
        smiley.tag = "Smiley";
        mr.material = SmileyMat;
        rbSmile.useGravity = false;


        // Scale and height final Maze
        BorderParent.transform.localScale *= 2;
        Plane.transform.localScale *= 2;
        Plane.transform.Translate(Vector3.down);

        //mc.CombineMeshes(true);
        //MeshRenderer bpmr = BorderParent.AddComponent<MeshRenderer>();
        //bpmr.material = Wall;
    }

    void PlaceHorizontalBorder(GameObject border, Cell c, Direction d) //borders are put moved away from the point to suround it
    {                                                   //upper border moved up, and lower border moved down along x axis
        Instantiate(border, c.position + Vector3.right * 0.5f * ((d == Direction.Up) ? 1 : -1), Quaternion.identity, BorderParent.transform);
    }

    void PlaceVerticalBorder(GameObject border, Cell c, Direction d)
    {                                                   //left border moved left, and right border moved right along z axis
        Instantiate(border, c.position + Vector3.forward * 0.5f * ((d == Direction.Left) ? 1 : -1), Quaternion.identity, BorderParent.transform);
    }


    private void ReduceMaze()
    {
        goaled = true;
    }
}